The tiny little rover ants, Brachymyrmex patagonicus, made the news a few weeks ago in an article in the Arizona Daily Star. Actually, it was about Javier Miguelena's doctoral research on rover ants. During his research, Miguelena found that rover ants need added moisture to do well in the deserts of Arizona. By adding water to the landscape, people are encouraging survival of rover ants.
When my son found a colony of rover ants in a potted plant we had just purchased at a plant sale this weekend, we decided to do some research ourselves. We separated the rover ants from the soil. There were 312 rover ants and 9 cocoons. We never found a queen, but we didn't remove all the soil from the plant's roots either.
Wonder where we'll find them next.